Fluid-meter.



J. W. LEDOUX. FLUID MBTEB.

'Arrmoulon FILED 10111122. 1911.

1,026,324. Paten ted May 14, 1912.

mr/vzssss; INVENTOR fl/W' John Lea/aux an. ,9 8y C) awe. 21M

ATTORNEY.

' constant relation to To all whom it may concern:

UNITED STATES PATENT OFFICE;

JOHN W. LEDOUX, OF SWABTHMORE, PENNSYLVANIA.

FLUID-METER.

' plicity of construction and accuracy of oo- 15' tion in a meter having an element or elements which will move at a changes in the velocity of flow of the fluid to be measured.

The drawing represents a sectional elevation of a meter embodying my invention. The mechanism shown in the drawing comprises the conduit 1 having the contracted section 1' (for carrying the fluid to be measured), in combination with the closed casing 2 containing the stationary displacing device 3 and a fluid 4 (of eater density than that to be measured), a net 5 connecting the body ornormal section of the conduit 1 with the interior of the casing 2 above the fluid 4 therein, and a duct 6 connecting the contracted section 1' of the conduit, through the device 3, with the interior of the casing i above the fluid 4.

sealed without any substantial A hood 7 covers the device 3, is sealed by the fluid 4, and is suspended by a cord 8 passing over a sheave9 to a counter weight 10, all suitably within the casing; the sheave being fixed on a shaft 11 journaled in bearings 12 and the shaft being adapted for operating a known type of Integrating or indicating mechanism (not shown).

The hood- 7 has its lower part 7' of enlarged but uniform cross-section, and the lowest portion 7" of the form of an inverted cone, providing a float or displacing device in combination with a reservoir which is displacement of the heavier fluid (such as mercury) when there is no' flow in the conduit. provided by the the upper part 0 stantly immersed fluid delivered to duit.

The displaein shown supporte neumatic tube 13 fixe to i the hood where it is conin the water or lighter the casing from the condevice- 3 which. is here by the pipe 6, is a figure Specification of Letters Patent. Application filed .nmzz, 1911.

rate bearing a Patented May 14, 1912. Serial No. 634,723.

of revolutionsuch that its cross-sectional area increases no flow in the conduit 1, to the line b-b to which themereury within the hood rises when the flow in the conduit reaches the maximum. The cross-sections of the displacing device 3 and the displacing part of the hood 7 are such that the cross-section of the mercury rising within the reservoir or cylindrical interior of the hood, due to the from the line aa, indicatmg the level of the mercury when there is displacement effected by the descent thereof with the rise of the velocity of flow in the conduit 1, shall control the movement of the hood so that such movement bears a constant ratio to the changes in'the velocity of flow.

It will be understood that when there is no flow in the conduit 1 the fluid pressures communicated through the ducts 5 and 6 are the same, hence the pressures within and without the hood 7 are the .same per unit area and the hood will stand at its greatest elevation with its lower edge touchlng the surface of themercury whose level is that of the line a-a. But as the velocity of flow in the conduit rises the resultant or difi'erence between the pressures communicated through the ducts increases, the lower or displacing part of the hood is forced down-v wardly 1n the mercury by the higher exterior pressure, the mercury displaced by the descending hood rises within the reservoir therein,.and the height of the rising mercury column, which is a function of the resultant pressure, is determinative of the dis tance moved by the hood. Consequently, by suitably shaping the displacing devices (the member 3 and the bottom of the member 7 subject to immersion) the desired movement of the member 7 and the shaft 8 operated thereby are obtained.

A valve 14, provided with a stem 14, is

I carried by the closed top 'of the hood andv automatically closes a port 15 therein. The stem is designed for engaging the part 3 to open thev port ifthe hood should fall below its normal low level; the effect of opening the' port being to ualize the pressures withln'and without t e hood, prevent the loss of-mercury by an overflow into the duct '6, and permit the e ass of air.

A vent 16, contro led by a cock 16' is provided at the top of the casing for dischargin air which may accumulate therein.

aving described my invention, I claim: 1. In a fluid meter, in combination Wlfll g; I r 1,026,324

a conduit having a contracted section, a, cated by changes in' said pressures, and a closedcasing, a hood comprising a reservoir stationary displacin device of varying and a float, a fluid in said casing in which cross section dispose in said reservoir, the said .floatis adapted :to be immerscdand cross section. of said stationary displacing s 'which seals said'reservoir, ducts connecting device increasing from .the normal level of 65 said contracted section and a diflerent secsaid liquid to the higher levels attained tion, of said conduit with the interior of thereby in said reservoir. said casin above saidfluid respectively 5, In a fluid meter, in combination gwith within an without said reservoir, and a a conduit having a contracted section, a casstationary displacing device of variable ing containing a liquid heavier than the 70 cross section within said reservoir, said disfluid to be measured, a hood adapted to replacing device and said float having cornci-procate in said casing, and to be sealedby plementary cross sections such that the said liquid, a stationary device of variable movement of said hood bears a constant horizontal cross section and'adapted to disratio to changes in the velocity of a fluid place said liquid in said hood, and ducts 75.

flowing in said conduit. connecting said contracted section and a dif- 2'. In a fluid meter, in combination with a ferent section of said conduit with theinconduit, a casing, a hood in said casing, terior of said casin above said liquid withmeans-whereby said hood is counterbalanced in and withoutsai hood respectively.

and adapted to reciprocate, a liquid. in said 6. In a fluid meter, in combination with 80 casing heavier than that to be measured 'a conduit, a casing, a reciprocating hood and adaptedfor sealing said hood, a stawithin said casing, said hood being protionary displacing device of variable cross vided with valve mechanism, means. wheresection within said hood, and means com- .by differential pressures are communicated prising ducts connecting said conduit with from fluid in said conduit to the interior of 85 the interior of said chamber above saidsaid casing above said liquid respectively heavier liquid respectively within and withwithin and without, said hood, and means out said hood whereby diflerentialpressures' for displacing liquid within said hood and exerted by fluid flowing in said conduit are opening said valve mechanism when said caused to act upon said hood. hood has descended toa predetermined limit. 90.

3. In a fluid meter, in combination with 7 In a fluid meter, in combination with a condu t, a closed casing, a liquid heavier a condu t, a closed casing, a hood adapted than that to be measured contained in to reciprocate within said casing, means for said casing, a hood in said casing sealed communicating differential pressures from .by said liquid, means whereby said hood is fluid flowing in said conduit t h in erio balanced and adapted to reciprocate; a Staof said casing within and without said hood, tionary displacing device of varying cross a liquid in said casing for sealin said hood, section disposed within said hood, and a displacing device within sai hood for means comprising ducts whereby diflerenregulating the rise of said liquid in said 46' tial pressures are communicated from a hood, and a valve vent for discharging air fluid flowing in said conduit to the interior from said casing. of said casing abovesaid liquid respectively 8. Ina fl'uid meter, in combination with I within and without said hood, the parts of a conduit, a closed casing, a hood adapted said displacing device and said hood subto reciprocate within saidcasing, means for 45 ject to immersion in said liquid having comcommunicating diflerential pressures "from plementary cross sections whibh vary so that fluid flowing in said conduit to the interior I the movement of said hood bears. a constant of said casing within and'without said hood ratlo to changes in the velocity of flow in respectively, a liquid in said casing of said conduit. greater specific gravity than that to be 50 4. In a fluid meter, in combination with measured, and a float located above said a conduit, mechanism whereby the pressure heavier liquid and attached to said hood for of fluid flowing in said conduit is diflerenexerting a constantforce for lifting said tiated, a hood comprising a reservoir and ahood. v Y A displacing device, a liquld which sealssaid In witness wh r f' have hereunto set V 55 reservoir and in which said displacing demy name this 21st day of June, 1911, in the vice is adapted to beimmersed,,means wherepresence of the subscribing witnesses.

by said dlflerentiated pressures are com-. JOHN W. LEDQUX. mumcated to the lnterior and exterior of Witnesses: v said hood, means. whereby said hood is Jos. G. DENNY, Jr.,

60 counter-balanced and adapted to be recipro O. N. BUTLER. 

